What to do with Nuclear Waste

This week, our expert Christopher Cahill was asked: Why don't we dump our radioactive waste into the Mariannas Trench, where it will be subducted?

After a reactor uses its nuclear fuel, there's still a lot of energy in it. It's still hot, highly radioactive and potentially harmful. The fission process has just slowed and is no longer efficient in creating electricity. How energy companies dispose of this waste is highly controversial and all kinds of proposals like dumping it into a trench in the middle of the ocean or shooting it out into space have been offered.

Are these proposals realistic? Dr. Cahill answers this question as a part of our Ask an Expert series:

See more questions and answers like this on Dr. Cahill's expert page.

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